A glass balloon at a constant temperature was weighed three times: 1) evacuated, 2) filled with air at atmospheric pressure, 3) filled with an unknown gas at a pressure of 1.5 atm. It turned out that p1 = 200 G, p2 = 204 G, p3 = 210 G. Determine the molecular weight of the unknown gas. Take the molecular weight of air to be 29.

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